Book/Report

FZJ-2019-01802

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Loading characteristics of the material interface in brazed divertor joint components under fusion relevant thermal loads

You, J.-H. (Corresponding author)FZJ*

1997
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/21806

Report No.: Juel-3345

Abstract: To simulate the cyclic HHF operations of the divertor components, actively cooled, brazed joint mock-ups were tested under cyclic electron beam irradiations. Five different armor tile materials with TZM heat sink were used. For the reference power density of 10.5 MW/m$^{2}$, thermal equilibrium was achieved within 20 seconds. The experimental results for the thermal response of the divertor mock-ups showed good agreement with the numerical analysis. The test mock-up with the MFC1/TZM joint showed an excellent heat removal ability. In the screening tests, the temperatures increased linearly with the input power density ranging from 7 MW/m$^{2}$ to 12 MW/m$^{2}$. The mock-ups armored with CFC tiles showed a good fatigue resistance and their thermal performance was stable. The electron microscopy revealed some microscopic damages in the bond interface. On the contrary, the mock-ups with graphite or ceramic tiles could survive only a single shut resulting in a abrupt fracture of the bont interface. The module with the Sepcarb N112/TZM joint showed a substantial thermal erosion under heat flux of 13.5 MW/m$^{2}$. Finite element method is employed to calculate the temperature and stress fields of the test mock-ups. The divertor mock-up with Sepcarb N112/TZM combination was analysed in detail. In the steady state, the temperature difference of 1200 °C has developed within the armor tile thickness. The stress evolution for the reference HHF pulse could be categorized in three fatigue modes. These are repeated mode, reversed mode and quasi-static mode. The interfacial stresses are relieved considerably during the thermal loading. Based on the equivalent stress amplitudes, maximum strain amplitudes were determined. The thermal stresses of the divertor modules for five different material combinations were investigated. The SiC30 armor tile experiences severe thermal stresses compared to the other armor tiles. The MFC1/TZM combination provides most favorable design options.

Note: English version report Jül-3286 (Sept 1996)

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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